As implicitly showed in [1]}, every right nilpotent left semi-brace is right nil. On the other hand, rnilp1 and rnilp2 state that, using the left cancellative left semi-braces characterized in Section 2, we can construct several examples of finite left cancellative left semi-braces that are right nil but not right nilpotent: as concrete examples, we consider below the left semi-braces obtained in Sections 3 and 4. Therefore, a large part of these left semi-braces answers in negative to [1]}.
